Fluent aphasia without weakness occurs due to which of the following culprit arteries?
**Core Concept**
Fluent aphasia without weakness, also known as Wernicke's aphasia, is a type of aphasia characterized by the inability to understand spoken language and a tendency to produce long, rambling, and nonsensical sentences. This condition is typically caused by damage to the posterior superior temporal gyrus, specifically the area surrounding Wernicke's area.
**Why the Correct Answer is Right**
The culprit artery responsible for fluent aphasia without weakness is the **Middle Cerebral Artery (MCA)**, more specifically its posterior division. The MCA supplies blood to the lateral surface of the brain, including the area surrounding Wernicke's area. When the MCA is occluded, it can lead to ischemia and damage to the surrounding brain tissue, resulting in Wernicke's aphasia. This type of aphasia is often associated with a lack of weakness due to the relatively intact motor cortex.
**Why Each Wrong Option is Incorrect**
* **Option A:** The Anterior Cerebral Artery (ACA) primarily supplies the medial surface of the brain, including the motor cortex, and is more commonly associated with weakness rather than fluent aphasia.
* **Option B:** The Posterior Cerebral Artery (PCA) supplies the occipital lobe and the medial temporal lobe, and is more commonly associated with visual disturbances rather than fluent aphasia.
* **Option D:** The Basilar Artery supplies the brainstem and the posterior inferior cerebellar arteries, and is more commonly associated with brainstem and cerebellar symptoms rather than fluent aphasia.
**Clinical Pearl / High-Yield Fact**
The MCA is one of the most common arteries to be occluded in stroke patients, and its occlusion can lead to a variety of symptoms depending on the location and extent of the damage. It's essential to recognize the clinical presentation of MCA occlusion, including fluent aphasia, to provide timely and appropriate treatment.
**Correct Answer:** C. Middle Cerebral Artery (MCA)